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(No Model.)

(No Model.) 2 SheetsSheet 2.

O. F. HEINRIOHS.

APPARATUS FOR MAKING 01711731) OARBONS.

No. 317,776. v Patented May 12, 1885.

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- UNITED STATES AVTENT m s.

CHARLES F..HEINRICHS, OF NEW YORK, N. Y.

APPARATUS FOR MAKING CURVED CARBONS.

SPECIFICATION forming part of Letters Patent No. 317,776, dated May 12,1885.

Application filed December 9, 1884. (No model.) Patented in France May13, 1879. No. 130,646; in England November 11, 1879, No.

4,589, and in Germany May 21, 1880, No. 13,802.

To all whom it may concern.-

Be it known that I, CHARLES FREDERICK Hnmnrons, of New York, in thecounty of New York and State of New York, have invented a new and usefulImprovement in the Manufacture of' Curved Carbon Pencils; and I doherebydeclare that the following is a full, clear, and exact descriptionof the same.

My invention relates to the apparatus employed for forming or shaping ofthe ground and plastic carbon employed in the manufacture of carbonpencils for electric lamps.

My invention consists in the hereinafter-described apparatus for firstforming the carbon in approximately the curved shape desired, andsubsequently pressing the carbon pencil so formed until the requireddensity has been obtained.

In the accompanying drawings, Figure 1 represents a side sectionalelevation of the apparatus employed for forming or shaping the carbons.Fig. 2 represents a sectional elevation of the pressure-dies inreadiness to press the curved carbon pencils. Fig. 3 represents theforming apparatus shown in Fig. l as mounted on the die-plate of thepress and adapted to act in connection therewith to feed the curvedcarbon issuing from the curved discharge-passage directly to the press.

An ordinary cylinder, at, having been secured to suitable frame-work,the piston c is withdrawn from the cylinder by means of the operation ofpinion g and rack-bar f, or by other equivalent means. The cylinder isthen filled with the ground and plastic carbon and the piston c isforced in, pressing the carbon out through the discharge-passage d,which is formed on a curve corresponding to the curvature of the carbonsto be manufactured, as at e, and thus I make circular carbon pencilswith ordinary mechanism as now known and used, with the exception ofmaking the discharge-passage curved instead of straight.

The curved carbons, after issuing from the curved discharge-passage,require further and more powerful compression in order to condense thematerial and bring them into proper condition for use in an electriclamp. Difficulty in carrying out this supplemental process consists,after giving the required amount of pressure, in extracting the carbonpencil from the dies without fracture. To carry out this part of theprocess in the manufacture of these pencils, I have provided an annulardieplate, a, having its cylindrical opening equal to the exteriordiameter of the carbon ring to be formed. In it is fitted a lowerannular plunger or die, 0, the annular ring which forms the die-faceproper being in thickness equal to the thickness of the ring carbon tobe formed. This is supported upon a base, 0, fixed to the plunger of ahydraulic press. An upper ring or die, I), the same in size and shape,is attached by a flange, B, to another plunger, D. These two dies fitaccurately within the die-plate a, and within them is a 1 plunger, 01,attached to the rod of a. piston,

E, working in a cylindrical central opening in the plunger F of thehydraulic press. The upper ring or die, I), being removed, the curvedcarbon is fed from the curved discharge-passage of the forming-press, asshown in Fig. 3, into the cavity formed by the walls of a and d, andupon the annular die a. The curved carbon as fed into the die-press issmaller than the cavity formed therein, so that it may enter it freely.After the forming-press is removed, as shown in dotted lines, Fig. 3,the upper annular die is brought down and pressure applied With thehydraulic press to prop' erly condense and shape the carbon. Thehydraulic pressure is then taken off the plunger F, and the plunger Dforces the carbon ring out of the die-plate a, but still resting uponthe die 0 and plunger d. The plunger (1 being then forced into theplunger F, the carbon ring can then be taken from the lower die, a,without liability to injury.

Having thus described my invention, what I claim is- 1. The hereinbeforedescribed apparatus for manufacturing carbons, consisting of aforming-press for the carbon, having a piston contained therein and acurved discharge-passage, and a die-press adapted to receive the curvedcarbon from the forming-press, com- 2. In the manufacture of carbonpencils for In testimony whereof I have signed my name 10 electriclamps, the combination, with the formto this specification in thepresence of two subing-press for the carbon and the piston conscribingwitnesses.

rained therein, of the curved discharge-pas- Y 5 sage, substantially asdescribed. CHARLES F. HEINRIGHS.

3. In the manufacture of carbon pencils for electric lamps, thedescribed die-press consist- Witnesses: ing of the die-plate a, the diesb c, and the F. L. MIDDLETON, plunger d, all substantially as described.WALTER DONALDSON.

